Google Vs Yahoo/Bing

Hello All, I would like to know from your experience. How much "potential" traffic do you get from Google as compared to Yahoo/Bing. I have observed that traffic ratio is as below: Google:Yahoo:Bing 70:25:5 Do let me know your inputs.

Ratio will be the same as you have mnentioned when it come to analysing it as most of the visitors use google for their searches so it will be on a higher scale from google and then will come the rest from yahoo and bing. After all it is about preference.

also take in consideration that Google is more popular in Europe for example; Bing i think is more of an American search engine

As I said, there will be variations due to location and the above statement is correct. I was just looking at figures which suggest 78/9/10 for the US (G/Y/B) and 95/2.5/1.5 for Europe (with the balances going to other SE's).
If we look at Asia, the Chinese SE Baidu has a strong presence so that it is 64/3/8 plus Baidu with 24.
So obviously it does depend on where you are in the world.
(source for figures: http://netmarketshare.com/)

I had a deeper look and in India (where the OP is based) the figures are very strongly pro-Google at 98/1/1
though I appreciate that is probably not the OP's target country.
I can't vouch for the accuracy of this source but it even provides data down to city level.

Perhaps we should be looking beyond potential traffic and more at what is actually happening.
For Google, Yahoo & Bing, of the traffic that comes from them to my site the ratio is 94:3:3.
However, those three SE's account for 70% of my traffic (66:2:2) which means that 30%, (which is a substantial amount) is coming from elsewhere. For example 12% come directly to the site and 14% are referrals.

I think as you have mentioned the results might remain the same when it comes to examining it as most of the guests use search engines for their queries so it will be on a greater range from search engines and then will come to relax from google and bing.